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Selective Synthesis of Trimethylamine by Catalytic N-Methylation of Ammonia and Ammonium Chloride by utilizing Carbon Dioxide and Molecular Hydrogen

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Leitner,  Walter
Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Aachen, Germany;
Research Group Leitner, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Beydoun, K., Thenert, K., Streng, E. S., Brosinski, S., Leitner, W., & Klankermayer, J. (2016). Selective Synthesis of Trimethylamine by Catalytic N-Methylation of Ammonia and Ammonium Chloride by utilizing Carbon Dioxide and Molecular Hydrogen. ChemCatChem, 8(1), 135-138. doi:10.1002/cctc.201501116.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-9AB2-3
Abstract
The synthesis of trimethylamine (TMA) through a multicomponent combination of ammonia with carbon dioxide and molecular hydrogen by using a homogeneous ruthenium catalyst was explored. The use of [Ru(triphos)(tmm)] [triphos: 1,1,1-tris(diphenylphosphinomethyl)ethane, tmm: trimethylene methane] together with aluminum trifluoromethanesulfonate as a co-catalyst resulted in high ammonia conversion and excellent selectivity for TMA in organic solvents. Aqueous solutions of ammonium chloride were methylated almost quantitatively to the corresponding hydrochloride salt (i.e., TMA⋅HCl) in a biphasic solvent system by using the same Ru complex without the need for any co-catalyst.